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    <script>

        // // ### 1.1  数组操作

        // // ​	题目描述：把下面数组的首尾两个元素互换
        var arr = ["鹿晗","王俊凯","蔡徐坤","彭于晏","周杰伦","刘德华","赵本山"];
        arr.shift()
        arr.unshift('赵本山')
        arr.pop()
        arr.push('鹿晗')
        console.log(arr);
    












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